greten and f



A. C. GRETEN AND F. MUSMAN.

FOUR-STROKE CYCLE INTERNAL COMBUSTION ENGINE.

APPLICATION FILED Nov. I4, 1919.

1,354,101 I Patented Sept. 28, 1920.4

2 SHEET-SHEET l.

f l ,lll/1111111111111 u u r/llllllllllll/ll I Il! I h Inventors: Augusle Clemenf grefon, Ednoi Mumtn A. c'. GRETEN ANDEF. MUSMAN. v

FOUR-STROKE CYCLE INTERNAL COMBUSTION ENGINE.

APPLICATION FILED'Nov. I4, 1919.

1,354,101. Patmdsept. 2s, 192.0.

2 SHEETS-SHEET 2.

l Invenfons: Auguste @lemmi grefen .Ed/lfm Numan UNITED smiles PATENT QFFICE.

AUGUSTE CLEMENT GRETEN AND FRANQOIS MUSMAN, F LUXEMBURG, LUXEMBURG FOURfSTROKE-CYCLE INTERNAL-COMBUSTION ENGINE.

To all whom t may concern Be it known that we, AUGUSTE CLEMENT GRErEN and YFRANoIs MUSMAN, subjects of the Grand Duchess of Luxemburg, re` siding, respectively, at Boulevard Exterieur 23 and Place' Giullaume 12, Luxemburg,

Luxemburg, have inyented certain new and useful' Improvements in Four-Stroke-Cycle Internal-Combustion Engines, of which the following is a specification.

The present invention relates to a lfour stroke cycle internal combustion engine with cylindrical sleeve yvalve and the novelty of the invention'consists in that a ring of exhaust ports,la ring of inlet yports Afor the oil gas and a ring of inlet ports fory compressed air are provided on the cylinder, and corresponding rings of ports are provided on the sleeve valve, said rings being positioned in such a manner that, during a four stroke cycle beginning after the expansion i l period the following results are secured:

(a) The exhaust gases flow Vfrom the cylinder into the exhaust duct through the registering rings Vof exhaust4 ports provided The.l fraction of combustion gases remaining in the cylinder and combustion chamber are wholly expelled by compressed air entering through the lower ring of inlet V ports provided `on the cylinder and the inpiston.

termediate ring of ports of the slide valve, which rings of ports are registering;

VThe cylinder and the combustion chamber are wholly filled with fresh air;

v(d.) The said fresh air with the exceptionV of thefraction contained in the combustion chamber, is expelled by the piston through the 'registering upper exhaust ports on sleeve' and cylinder, during the upward stroke of the piston.

(e) A smallf amount' of fresh airis again sucked bythe 'piston into the; cylinder throughV the exhaust ports during the beginning of the downward strokek of the duringa further downward motion of the piston, all ports being closed. v

(g) Oil gas from' the carbureter is fed tothe cylinder through the registering n- A vvacuum is gformed inthe cylinder Specicationof ILettersEatent. i Patented Sept. 28, 1920. Application mea Nwembeii 14, 1919. serial No. 337,925.

termediate ring of ports 'of both cylinder and sleeve valve.

(7l.) Compressed air enters the cylinder through the lower registering rings of ports of cylinder and sleeve valve.

The above results will clearly result from the following description, with reference to the accompanying drawing, given by way of example, in which:

Figure 1 is an axial section of a four stroke cycle internal combustion engine.

Figs. 2 to 9 are diagrammatic views showing various relative positions of the cylinder,sleeve valve, piston and crank shafts, during a complete four stroke cycle.

In these figures:

Y 1 is thevcylinder, of the motor, 3, the piston` Between cylinder 1 and piston 3 is engaged the cylindrical sleeve valve 2 provided with the three rings of ports 4, 5 and 6, while the cylinder is provided with corresponding rings of ports 7, 8 and 9.

.10 is the exhaust duct for the burned gases, from which they escape to the atmospheric air. A

1l is the gas admission duct, 12 the compressed air admission duct.

15 is the crank pin on the motor shaft, 16 thecrank pin on the half time shaft 14.

Following the motion of the various movable parts 'during one complete cycle, we observe that Fig.'2 corresponds to the end of the expansion period. A

y Sleevevalve 2 andfpiston 3 are moving downward; crank pin 15 is near its outer dead center and pin 16 of the half time shaft crank is `moving in the same direction as pin v15. All ports are still closed. Referring Vto Fig. 3, pin 15 has reached its outer dead center; the upper or exhaust ports 4 of the sleeve-valve uncover the corsaid air escapes through the registering exhaust ducts 4 and 7, expelling every remaining particle of combustion gases. This may be considered as an extension of the above exhaust stage.

It `ma be observed that, owing to the plurality of large port-s all around the cylinder and sleeve valve, tl e combustion gases are quickly evacuated and a large amount of compressed air flows .through the cylinder and combustion chamber.

Following the motion of both pins 15 and 16, we observe that, while pin 16 of sleeve-l valve 2 is reaching its outer dead center, crank pin 15 moves upward, wherebythe pistonexpels the fresh air from the cylin- Vder 1 up to the ycombustion chamber, in

in the combustion chamber; this stage may also be consideredas the beginning of the suction period.

Pin 15 has reached its inner dead center (Fig. 4) and the piston now begins its downward stroke, wherebyr it sucks al small -amount of air fr'omthe registering exhaust ports -t and 7 into the cylinder until the sleeve valve 2, which is sliding upward, closes the ports '7. This is a stage of suction of fresh air, following the above mentioned beginning of suction of fresh air. Y

Now the ports 7 being closed, and the piston moving downward, (Fig. 5), la vacuumV is produced within the cylinder, until crank pin 15, during its forward motion, reaches the position shown in Fig. 6;

Y pin 16 is moving vupward andthe intermediate ,ports 5 of sleeve valve areregistering with theY intermediate ports 8 of the cylinder. The latter occurs in a position` of Vthe arts between those' shown in Figs. 6 and and oil gas fromv the carbureter enters the cylinder, filling the latter. This stage is a third part of the suction period. The piston, following its downward motion, `pin Y 15 reaches its outer center Fig. 8, whereby the piston is in its lowermost position. .At the same time valve sleeve2 moving upward, the ,lower ports 6 and 9 of vsleeve and cylinder register, and compressed air from duct 12l owsto the cylinder. AThis stage is a fourth part ofthe suction period. n

Finally the piston, moving lupward from its outer Vdead center, and all ports being closed, the explosive mixture is compressed until the explosion occurs (Fig. 9), whereby tlie'pin 15 `reaches its VinnerV deadv center, after which the piston Vis forced `downward while the sleeve is already moving downward; having passed its inner dead center.

Having now fullyV described our said invention, what we claim and desire to secure by Letters Patent, is:

1. An internal combustion engine comprising a cylinder having an exhaust passage, an inlet passage and anair passage,la piston mounted in the cylinder to reciprocate, a sleeve mounted inthe cylinder between the piston and cylinder and formed with passages corresponding to .those in said cylinder, and means for operating the sleeve,

to hold the exhaust passage open during the first part of the downward'movement of the piston, to close all the passages during another portion of the downward4 movement of the piston, subsequently opening the intake passage during farther downward movement of the piston, and thereafter opening the air passage at the Vlower limit of movement of the piston, and then closing all passages during the next entire upward movement of said piston.

2. An internal combustion engine comprising a cylinder having exhaust ports in the upper end portion thereof, air ports in the lower end portion and' gas inlet ports between the aforementioned ports, a single sleeve having three sets `of ports formed therein and a piston mounted in the sleeve for reciprocating motion, one set-of portsin the sleeve openingvthe exhaust ports in the cylinder during the upward and :partial downward movementV of the piston, the second set of ports in thesleeve opening and closing the air ports in the cylinder while the exhaust ports are open, the second set of ports subsequently opening the inlet ports of the cylinderl while the other ports Vare closed, and thethird set of ports in the sleeve opening the air `ports in the` cylinder subsequent to the opening and closing of the inlet ports.

3. An internal combustion` engine comprising a cylinder, having an exhaust passage, an inletipassage, and Va compressed air passage, a sleeve mounted in said cylinder having corresponding passages,v and means for operating lsaid sleeve to open and close the passages, lsaid means opening the exhaust 4passage and subsequently the .air passage when the piston is at theV lower limit of the explosion stroke, closing thel air vpassage as the piston moves upward, and holding the exhaust passage O pen during the entire upward movement of the piston and a portion of the following downward movecorresponding with the passages in the upward movement of the piston and a porcylinder, a piston mounted for reoiprocation tion of the following downward movement.

in said sleeve, and means for operating the In testimon)7 whereof we have hereunto sleeve to cause one' set of passages to open set our hands in presence of two witnesses. 5 the exhaust passage, and a second set of AUGUSTE CLEMENT GRETEN passages to open the air passage when the y T T piston is at the lower limit of the explosion FRAh @01S MUSMAB stroke, subsequently closing the air passage Witnesses: as the piston moves upward, and holding JOB LoHNTz, l0 the exhaust passage open during the entire JEAN AIGHER. 

